Japanese Prime Minister Kishida Fumio is expected to stress the importance of the rule of law when he delivers a speech at the UN General Assembly in New York.
Kishida is also likely to emphasize the need to strengthen the functions of the United Nations and reform the Security Council.
He will make the appeals at the General Assembly next week, as Russia's invasion of Ukraine continues to drag on.
Arrangements are being made for Kishida to attend a leader-level meeting designed to "build momentum towards facilitating the entry into force of the Comprehensive Nuclear-Test-Ban Treaty."
Preparations are also being made, so that Foreign Minister Hayashi Yoshimasa can attend the UN assembly.
Hayashi is considering taking part in two foreign ministers' meetings, the Group of Seven's and the Quad group's. The Quad consists of Japan, the US, Australia and India.
The ministers are expected to discuss how to respond to the conflict in Ukraine and China's increasing assertiveness.
The foreign ministers of Japan, Germany, Brazil and India are also likely to meet in order to discuss the need to reform the Security Council. The four countries want to be permanent members of the council.